This short film purports to be about the intricacies of sound technology, but it's really more of an excuse to showcase a batch of big-name MGM stars and some coming attractions. But either way it's fascinating. We go behind the scenes for the filming of a scene featuring Jeannette McDonald and Nelson Eddy, and get a glimpse of the massive technicolor camera being used. There is also a scene featuring Clark Gable and Hedy Lamarr, in which we see their voices represented as sound waves. But this is all surface-level stuff and a prelude to an extended preview of coming attractions. And what a preview it is! Clark Gable, Greer Garson, Myrna Loy, William Powell, Judy Garland, Joan Crawford, Lionel Barrymore, James Stewart, Katharine Hepburn, one right after the next. There's a nostalgic thrill in seeing a preview for "The Philadelphia Story" before anyone knew that that movie would become one of the most beloved of all time. Fun stuff.